The ZW pairs of two paleognath birds from two orders show transitional stages of sex chromosome differentiation
The ZW pairs of two paleognath birds from two orders show transitional stages of sex chromosome differentiation
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DOI：
10.1023/a:1009241528994
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发表时间：
1999-01-01
影响因子：
2.6
通讯作者：
Solari, AJ
中科院分区：
文献类型：
--
作者：
Pigozzi, MI;Solari, AJ
粗线期卵母细胞从两个可能是最原始的订单（古颌）之间的生活鸟类被用来研究配对行为和重组结节（RNs）的性对的位置。在平胸Pterocnemia pennata（Rheiformes），42分析ZW对显示平均2.2 RN分布沿着80%的联会复合体（SC），覆盖长臂的近端着丝粒Z和W染色体在这个同形性对。在tinamid Rynchotus rufescens（Tinamiformes），60个分析的ZW对显示平均1.35 RN分布沿着66%的SC覆盖大部分的长臂，这个明显异形ZW对。RNs是非随机分布的，在两个物种中都显示出干扰，但在tinamou中，它们被限制在一个明显较小的范围内。RN位置限制的中间程度的发现，介于平胸类中沿着沿着大部分W的自由重组和Neognath鸟类中单个RN的严格定位之间，表明其与鸟类性染色体分化机制的关系。
Pachytene oocytes from the two presumably most primitive orders (Paleognathae) among living birds were used to study the pairing behaviour and location of recombination nodules (RNs) in the sex pair. In the ratite Pterocnemia pennata (Rheiformes), the 42 analyzed ZW pairs show an average of 2.2 RNs distributed along 80% of the synaptonemal complex (SC) that covers the long arm of the acrocentric Z and W chromosomes in this homomorphic sex pair. In the tinamid Rynchotus rufescens (Tinamiformes), the 60 analyzed ZW pairs show an average of 1.35 RNs distributed along 66% of the SC covering most of the long arms of this visibly heteromorphic ZW pair. RNs are non-randomly distributed and show interference in both species, but in the tinamou they are restricted to a significantly smaller stretch. The discovery of an intermediate degree in the restriction of RN location, between the extremes of free recombination along most of the W in ratites and strict localization of a single RN in Neognath birds, suggests its relationship with the mechanism of sex chromosome differentiation among Aves.